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Hydroponic Tomato (Lycopersicon esculentum) Response to Dicamba in the Nutrient Media1

Published online by Cambridge University Press:  20 January 2017

Jerron T. Schmoll ,
S. Kent Harrison ,
Emilie E. Regnier  and
Mark A. Bennett
Jerron T. Schmoll*
Affiliation:
Department of Horticulture and Crop Science; The Ohio State University, Columbus, OH 43210
S. Kent Harrison
Affiliation:
Department of Horticulture and Crop Science; The Ohio State University, Columbus, OH 43210
Emilie E. Regnier
Affiliation:
Department of Horticulture and Crop Science; The Ohio State University, Columbus, OH 43210
Mark A. Bennett
Affiliation:
Department of Horticulture and Crop Science; The Ohio State University, Columbus, OH 43210
*
Corresponding author's E-mail: [email protected].
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Abstract

A greenhouse study was conducted to determine the effects of sublethal dicamba concentrations in the nutrient media on hydroponically grown tomato plants. Tomato leaf area was the most sensitive vegetative growth parameter measured in response to dicamba concentrations, ranging from 0 to 22 µg/L. Leaf area was reduced 31 and 76%, and specific leaf weights, a relative measure of leaf thickness (g/cm2), increased 26 and 121% after 30-d exposure to dicamba concentrations of 2.2 and 22 µg/L, respectively. In long-term experiments conducted until plants produced first ripe fruit, regression analysis indicated leaf area reductions of 8 and 66% from initial dicamba concentrations of 1 and 10 µg/L, respectively. Reductions in total fruit fresh weight were highly correlated (r = 0.93) with leaf area reductions caused by dicamba. A hyperbolic regression model gave predicted losses in fruit fresh weight per plant of 6% at 1 µg/L dicamba and 73% at 10 µg/L dicamba (r 2 = 0.87). Results generally indicated that the level of dicamba in the nutrient media of hydroponically grown tomatoes that produced no observable effect was ≤ 1 µg/L.

Keywords

Dicambatomato, Lycopersicon esculentum L. ‘Trust’Groundwater contaminationherbicide bioassayCID, centimeter inside diameterDAT, days after transplantEC, electrical conductivityPI, plant introduction
Type
Research Article
Information
Weed Technology , Volume 14 , Issue 3 , September 2000 , pp. 562 - 568
Copyright
Copyright © Weed Science Society of America 

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